Waxy, powdery, violet-earthy. The smell of cold cream on a grandmother's dressing table — cosmetic, rooty, faintly buttery, with a chalky dryness that clings to skin for days.
Powdery and violet-woody at the surface, with a buttery-fatty undertone that distinguishes it from ionone-based iris accords. Drier than violet leaf absolute, warmer than methyl ionone, earthier than any synthetic iris molecule. The rooty, almost carrot-like base note reveals the rhizome origin. A chalky, cosmetic-powder dryness persists throughout — not sweet, not sharp, but quietly insistent. The myristic acid fraction adds a waxy, skin-like warmth that pure irones lack.
Evolution over time
Immediately
Immediately
Waxy, fatty-buttery opening. Myristic acid warmth dominates initially. Violet-powdery irone character emerges within minutes.
Persistent chalky-powdery base. Rooty, faintly earthy, skin-intimate. Remarkable tenacity — TGSC documents 296 hours at full concentration.
Terroir & Origins
Indicative 2025 wholesale prices.
The Full Story
Orris concrete is the steam-distilled product of aged Iris pallida or Iris germanica rhizomes. It is semi-solid at room temperature — a pale yellow wax that melts near 40–46 °C — because roughly 60–85% of its mass is myristic acid and other saturated fatty acids. The aromatic fraction constitutes only 8–20% of the material: principally cis-γ-irone (30–40% of total irones), cis-α-irone (20–30%), and smaller amounts of trans-α-irone and β-irone. These irones carry the powdery-violet-woody signature. The molecular formula is C₁₄H₂₂O (MW 206.32), CAS 79-69-6 for the irone mixture.
The rhizomes are harvested after 3–4 years of growth, then peeled, dried, and stored for an additional 3–5 years. During this aging, iridal triterpenoids (C₃₁ compounds) undergo slow oxidative degradation, cleaving to produce irone molecules — the fragrant C₁₄ ketones. Fresh rhizomes contain no irones whatsoever. The total timeline from planting to usable material is 6–8 years, which partly explains the cost: €10,000–12,000 per kilogram for concrete, and up to €70,000 per kilogram for orris absolute (the alcohol-washed, fat-free concentrate with 55–85% irone content).
The scent itself sits between violet and suede. Drier than ionones, fattier than violet leaf, with an earthy-rooty undertone that synthetic alternatives struggle to replicate. The powdery quality is particular — not talc, not rice powder, but something closer to the smell of old face powder compacts. The buttery note from the myristic acid fracti on gives warmth without sweetness. On skin, the material is tenacious: TGSC documents substantivity of 296 hours at 100% concentrati on.
Fresh iris rhizomes are odorless. The violet-powdery scent develops only during years of storage, as iridal triterpenoids — large C₃₁ molecules with no fragrance — slowly oxidize and cleave into irone, a C₁₄ ketone. The chemistry was elucidated by Rautenstrauch and Ohloff in 1983, solving a puzzle that had confounded chemists since Tiemann first isolated irone in 1893.
Extraction & Chemistry
Extraction method: Steam distillation (hydrodistillation) of dried, aged Iris pallida or Iris germanica rhizomes. Rhizomes are grown for 3–4 years, harvested, peeled, dried, then stored for 3–5 additional years to allow oxidative formation of irones from iridal triterpenoid precursors. The distillate solidifies at room temperature due to high myristic acid content (60–85%), producing a waxy mass — hence the trade names 'orris butter' and 'orris concrete.' Yield: 0.2–0.3% from dried rhizomes, meaning approximately 500 kg of aged rhizomes yield 1 kg of concrete. Primary production: Tuscany, Italy (around Florence — the historic center since the Renaissance) and Morocco. Orris absolute, a further refinement via alcohol washing to remove fatty acids, concentrates irone content to 55–85% and costs approximately €70,000/kg. The concrete itself trades at €10,000–12,000/kg.
Heart-to-base material in iris, powdery, and skin-scent compositions. Orris concrete serves as both a signature ingredient and a natural fixative — the high myristic acid content anchors volatile top notes. In chypre structures, it provides the powdery bridge between bergamot and oakmoss. In skin-intimate compositions, the buttery-earthy quality reads as warmth against the body. Synthetic alternatives exist but none replicate the full profile. Alph a-isomethyl ionone (CAS 127-51-5) captures the violet-powdery quality. Methyl ionone gamm a provides a cleaner, more transparent iris effect. Ionones — alph a, bet a, and methyl variants — form the backbone of synthetic iris accords, but lack the fatty-rooty base note of the natural concrete.
